I did not want or intend to buy the Chinese cutters. But at $99 for a set of 8, it moves me forward. I did buy a 7/8" arbor a while back. How do you mount these cutters with Bore: 22mm - 0.866142in (7/8 = 0.875)? Granted my NMTB 50 7/8" arbor needs a key slot & spacers, I'd rather not cut it down to 22mm. Are you all increasing the I.D. of the cutters? What is the general best way here?